[masraum]

I think it's really all been covered, but in general, I would think that a lower (higher number) final drive than 2.2:1 would make your 928 more fun to drive.

I'm assuming that you'll be doing most of your driving in the 40-80mph range or maybe 30-100. What's the theoretical top speed of your car, 140, 150, 170 (if it had enough power)? Are you looking for low gears to maximize fuel economy on really long drives? I assume your car isn't going to have peak power at a very low RPM. Yeah, a little higher should give you a bit more fun at normal speeds.

My understanding is that automatic transmissions usually have lower gears than manual transmission and I think part of the reason is because the torque converter can actually function as a torque multiplier under some circumstances.

From wikipedia
"The key characteristic of a torque converter is its ability to multiply torque when there is a substantial difference between input and output rotational speed, thus providing the equivalent of a reduction gear. This is a feature beyond that of the simple fluid coupling, which can match speeds but only provides the same torque, thus less power."